Duplicated
Last Updated: 13 May 2025 07:47 by ADMIN
Created by: Harald
Comments: 0
Category: FileManager
Type: Feature Request
1
While many properties of the `TelerikUpload` component inside the `TelerikFileManager` are customizable using the `FileManagerUploadSettings` some aren't.

The `Multiple` property is always set to `false` (see code below); one can drag & drop multiple files to the dropzone but only one is uploaded at a time.
Our customers won't accept this behavior as it makes uploads of multiple files very cumbersome. This "detail" makes the `TelerikFileManager` unsuitable for our application.

Please make the `Multiple` property configurable via the `FileManagerUploadSettings`.
(You may also want to consider making `AutoUpload` configurable while you're at it).
__builder2.OpenComponent<TelerikUpload>(266);
__builder2.AddAttribute(267, "AutoUpload", (object?)RuntimeHelpers.TypeCheck(value: true));
__builder2.AddAttribute(268, "SaveUrl", (object?)RuntimeHelpers.TypeCheck(UploadSettings.SaveUrl));
__builder2.AddAttribute(269, "SaveField", (object?)RuntimeHelpers.TypeCheck(UploadSettings.SaveField));
__builder2.AddAttribute(270, "RemoveUrl", (object?)RuntimeHelpers.TypeCheck(UploadSettings.RemoveUrl));
__builder2.AddAttribute(271, "RemoveField", (object?)RuntimeHelpers.TypeCheck(UploadSettings.RemoveField));
__builder2.AddAttribute(272, "WithCredentials", (object?)RuntimeHelpers.TypeCheck(UploadSettings.WithCredentials));
__builder2.AddAttribute(273, "Multiple", (object?)RuntimeHelpers.TypeCheck(value: false));
__builder2.AddAttribute(274, "AllowedExtensions", RuntimeHelpers.TypeCheck(UploadSettings.AllowedExtensions));
__builder2.AddAttribute(275, "MinFileSize", RuntimeHelpers.TypeCheck(UploadSettings.MinFileSize));


Duplicated
Last Updated: 07 May 2025 13:31 by ADMIN
Created by: Otemu
Comments: 0
Category: Editor
Type: Feature Request
1
Please expose a track changes feature similar to the one in the RadEditor for ASP.NET AJAX: https://demos.telerik.com/aspnet-ajax/editor/examples/trackchanges/defaultcs.aspx.
Duplicated
Last Updated: 02 May 2025 08:28 by ADMIN
Created by: Daniel
Comments: 2
Category: DateTimePicker
Type: Feature Request
0
Currently there is a DisabledDates param on your DatePicker component which is extremely useful, however on the DateTimePicker, it appears there is no way to disabled a list of DateTimes. For now it seems the only work around is once a disabled date is selected, to fire an event and inform the user they cannot select that date and null out what they selected. However a very nice feature to have would be to pass in a list of disabled dates directly to the DateTimePicker similar to DatePicker.

Code example:


Possible:
private List<DateTime> _disabledDates = new();
<TelerikDatePicker DisabledDates="_disabledDates">

Not Possible (Requested Feature)
private List<DateTime> _disabledDates = new();
<TelerikDateTimePicker DisabledDates="_disabledDates">

Duplicated
Last Updated: 16 Apr 2025 07:49 by ADMIN
Created by: Nathan
Comments: 2
Category: UI for Blazor
Type: Feature Request
1
I would be very helpful if the Window and Dialog components had a "CloseOnEsc" Boolean Parameter that would control what would happen if the Esc key was pressed while the dialog is visible.
Duplicated
Last Updated: 11 Apr 2025 07:02 by ADMIN

Please consider adding built-in support for a TextTruncationWithAction or TruncateWithButton mode on GridColumn components. This feature would display long text as truncated with ellipsis (...) and a button or icon to reveal the full content, such as in a modal or popover.

Why This Is Needed

In enterprise applications like ERP, cutover planning, or audit logs, we often display descriptions, notes, or comments that can span multiple lines. However:

 

  • Wrapping ruins compact grid layouts.
  • Truncating with ellipsis alone hides valuable content.
  • Users need quick, inline access to full text without leaving the grid.

 

Duplicated
Last Updated: 07 Apr 2025 10:59 by ADMIN
Created by: Erik
Comments: 0
Category: UI for Blazor
Type: Feature Request
1

I have come across a few instances where it would be awesome if the Data Collection on a MultiSelect, or even a DropDown could have a dynamic property to denote if the option in the collection is selectable. The use case is around items being disabled but remain intact on historical records. If I remove the item currently from the collection then the component no longer shows the item as selected because it isnt in the collection. If I leave the item in the collection, then it shows, but, can then be selected on future items, which I dont want. Would be awesome if I could pass a component parameter, similar to TextField, which is the bool property for if the option in the dropdown is selectable/disabled. This would then make it so that the item could be REMOVED, but not readded or selected on future records unless the value for the property was set back to true. 

Duplicated
Last Updated: 07 Apr 2025 06:42 by ADMIN
Created by: Ken
Comments: 0
Category: UI for Blazor
Type: Feature Request
1

Please add a property (e.g., OpenOnFocus or AutoOpenOnEdit) to dropdown-based components (such as DropDownList, ComboBox, or inline grid editors) to automatically open the dropdown when the component gains focus or enters edit mode.


Why This Matters

In data-dense UIs — like inline grid editing, cutover task assignment, or status changes — users often need to:

 

  • Quickly select from a known list, such as Status, Owner, or Type.
  • Tab rapidly through form fields without needing extra clicks.
  • Use keyboard-only navigation efficiently.

Currently, dropdowns often require an additional manual click to open — which slows down power users and disrupts workflows in editable grids.


Duplicated
Last Updated: 04 Apr 2025 11:29 by ADMIN
Created by: Jared
Comments: 1
Category: UI for Blazor
Type: Feature Request
0

Grids honor the [DisplayFormat(DataFormatString ... )] annotation for column content, but the FilterMenuType.CheckBoxList filter menu and the TelerikCheckBoxListFilter component don't. This is particularly noteworthy for formatting that truncates the contents such as DateTime which frequently tracks data smaller than user's care about, which can generate many visually identical checkboxes. To go along with the requested change, it would be nice if the filter matched off of the DisplayFormat string considering that is what the user sees and would therefore be referencing, since again, many DataFormatStrings can truncate data.

Because the TelerikCheckBoxListFilter component requires the field to match the data type of the grid's field, there isn't a way for the programmer to choose to show the filter menu with a checklist that matches the displayed values without building a fully custom FilterMenuTemplate with their own foreach loop and then figuring out a way to construct a CompositeFilterDescriptor filled with bracketing FilterDescriptors to account for the range of matching values. This is doubly troublesome since using the structure of CompositeFilterDescriptors needed to do that is not supported in the FilterMenuTemplate without also having to override the FilterMenuButtonsTemplate.

Generally speaking, it would make more sense to the users if the default options in the filter logically and visually matched with the default displayed values.

Reference material:
Grid column contents: https://www.telerik.com/blazor-ui/documentation/components/grid/columns/display-format
Checkbox List: https://www.telerik.com/blazor-ui/documentation/components/grid/filter/checkboxlist
Alternate FilterDescriptor shapes not supported: https://feedback.telerik.com/blazor/1681745-clear-button-in-grid-filtermenu-not-properly-clearing-custom-filter

Example Repl: https://blazorrepl.telerik.com/mJOSuxQw117zM1h321

Duplicated
Last Updated: 31 Mar 2025 08:23 by ADMIN
Created by: Edwin
Comments: 0
Category: UI for Blazor
Type: Feature Request
0

can you provide a initial File click event handler attribute?

I want the user to be able to click on an initial file to download the file.

Duplicated
Last Updated: 18 Mar 2025 14:45 by ADMIN
Created by: Harry
Comments: 3
Category: Menu
Type: Feature Request
0
For accessibility we need the menu to show on click and hide on click. We would also like to be able to reproduce the CloseOnClick behaviour from the OnClick handler. It would be good to be able to call TelerikMenu.Close() or something similar
Duplicated
Last Updated: 13 Mar 2025 04:45 by Eduardo
Created by: Brian
Comments: 2
Category: TileLayout
Type: Feature Request
6
I want to change the Reordable and Resizable parameters at runtime. However, when updating the reorder/resize parameters, the component is re-rendered, enabling the cursors for resize and drag/drop but no functionality.
Duplicated
Last Updated: 12 Mar 2025 14:35 by ADMIN

Hi.

When you have a TelerikGrid, with on OnRead event making an async call, the pager that comes with TelerikGrid doesn't show the mobile view when on a narrower device.

 

I created a blazor repl here: https://blazorrepl.telerik.com/mxOPbEuZ29PQRAQk02

 

If you view the repl in browser, open dev tools and toggle the device toolbar, and set your viewport width to something around 320px. If it loads into the preview right away, after having been first rendered on normal screensize, then the pager will adapt. To see the bug, go to the code tab, then the preview tab to have it do its initial render on mobile width. You will see something like this:

This is an issue live currently on my own websites, which had been reported to me by customers. I believe this only occurs when using the Grid's OnRead, and making an asynchronous call within it (which I represented in the repl with a Task.Delay)

I'm using as early as 3.5.0 in production, but can repro this on latest, 3.7.0.

Duplicated
Last Updated: 05 Mar 2025 08:34 by ADMIN
Created by: Mindaugas
Comments: 0
Category: PDFViewer
Type: Feature Request
11

We still have some problems with printed pdf quality after the updates in 6.0.0. When pdf is printed using Telerik PDF viewer it seems it gets processed/rasterized and loses quality.

 

Duplicated
Last Updated: 04 Mar 2025 15:03 by ADMIN
Created by: Kevin
Comments: 1
Category: UI for Blazor
Type: Bug Report
0

Hello,

i am trying to add a Clear Button inside the DropDownList-Component.

I tried to follow the instructions provided here: How do I add a Clear button to a DropDownList? in UI for Blazor | Telerik Forums respectiveley here: Telerik REPL for Blazor - The best place to play, experiment, share & learn using Blazor.

But unfortunateley, the button is never inside the component. It's always next to it or under the component.

In your example provided above, the button is inside the component.

I would love to have any solution for this one. A clear button is needed quite often.

I also have attached our custom component, where we use the Telerik DropDownList Component.

Thank you

Duplicated
Last Updated: 14 Feb 2025 12:05 by ADMIN

Hello together,

we are running into a problem with TelerikPdfViewer. When clicking the download button, download starts and performs properly.

BUT: the downloaded PDF file does not match the PDF that was provided via Data="@PdfData". On download something internally prepends some text to the PDF:

–€À³JS.ReceiveByteArray’Æ ‘¢%PDF-1.7
%úûüý
3 0 obj
<</ca 1.00000 /AIS false >>
endobj
5 0 obj

The original PDF file starts at "%PDF-1.7" (end of first line). That part before (including that "JS.ReceiveByteArray") was somehow added during the download workflow by Telerik. We ensured that the PDF data we provided to the viewer (via Data="@PdfData") ist valid. We did so by inspecting the byte[]-Array manually in the debugger as well as downloading it via a JS function to the client.

This is how we are using the TelerikPdfViewer. But the error occurs no matter if we are handling the OnDownload-Event (setting the filename) or not handlign that event at all (i.e. eliminating the OnDownload="@OnPdfDownload" completely)

        <TelerikPdfViewer Data="@PdfData" Width="100%" Height="100%" Zoom="1m" OnDownload="@OnPdfDownload">
            <PdfViewerToolBar>
                <PdfViewerToolBarPagerTool />

                <PdfViewerToolBarSpacer />

                <PdfViewerToolBarZoomTool />
                <PdfViewerToolBarSelectionTool />
                <PdfViewerToolBarSearchTool />

                <PdfViewerToolBarSpacer />

                <PdfViewerToolBarDownloadTool />
                <PdfViewerToolBarPrintTool />
            </PdfViewerToolBar>
        </TelerikPdfViewer>

We use Telerik.UI.for.Blazor (6.2.0).

Thanks for your feedback on this issue and best regards!

Sebastian

Duplicated
Last Updated: 10 Feb 2025 13:08 by ADMIN
Created by: ranga
Comments: 0
Category: UI for Blazor
Type: Feature Request
0

We need a formal, Accordion component. This is missing like a sore thumb ! 

The Accordion should be the first component in the component list.

Using the panel bar is not the same as the functionality of Accordion. So, do not mark this request as a duplicate of a panel bar enhancement request.

This is a simple component and I request you to prioritize and release it urgently in the next release.

Thanks.

 

 

Duplicated
Last Updated: 07 Feb 2025 14:07 by ADMIN
Hello,

This seems to be a regression in this version. I cannot find an open issue on it. I think it's the same as this issue.

Here is a REPL link with the issue recreated. The bug happens the second time you open the dialog. You can see on the first close of the dialog that the parent window z-index is increased by 2. Then the second time you open the dialog the z-index is less than it's "parent" component.

Please link me to the current issue if there is an open duplicate.

Kind regards,
Linda
Duplicated
Last Updated: 23 Jan 2025 08:36 by ADMIN
Created by: Jean-Marc
Comments: 3
Category: Scheduler
Type: Bug Report
0

Bug reproduced systematically on web browser Edge (131.0.29.03.146) & Firefox (134.0).

Beware: culture is fr-FR

Scheduler component sometimes put appointments at wrong coordinates (hour if ok but the day is wrong).

The screenshot "ExampleWrongCoordinates.png" set an example of an item wrongfully located. In this picture, console log shows details of the razor element who's supposed to be located on Tuesday 14th of January 2025 .. but which is rendered on Monday instead!

Appointments model defines "default (expected) property names Start & End":

private DateTime _start;

public DateTime Start
{
    get { return _start; }
    set { _start = value; }
}

private DateTime _end;

public DateTime End
{
    get { return _end; }
    set { _end = value; }
}

View is MultiDay but the glitch is the same on Week view.

Now if we switch on day view and navigate to Tuesday 14, scheduler shows the appointment on hours column! If we click it, a JS error is raised (Cf screenshot "ClickAppointmentWrongCoordinates.png").

Duplicated
Last Updated: 20 Dec 2024 06:44 by ADMIN
Created by: JeffSM
Comments: 0
Category: UI for Blazor
Type: Feature Request
1
Please a QR Code Reader would be great.
Duplicated
Last Updated: 18 Dec 2024 16:27 by ADMIN
Created by: Constantinos Petridis
Comments: 4
Category: TabStrip
Type: Bug Report
0

We have recently update to version 7.0.0 of Telerik for Blazor controls.
We have also access to Progress ThemeBuilder application which we use to customize the default Material theme.

After the update to version 7 and also upgrading and compiling the new theme file for our application, TabStrip items fail to display the correct css and defaults to the theme's original css.

ThemeBuilder produces rules for the tab item items with the following path

.lvs-tabstrip.k-tabstrip .k-tabstrip-items-wrapper .k-tabstrip-items.k-reset.k-tabstrip-items-start .k-item.k-tabstrip-item

where the actual control generates the following

.lvs-tabstrip.k-tabstrip .k-tabstrip-items-wrapper .k-tabstrip-items.k-reset.k-tabstrip-items-start .k-item

As you can see it is missing the k-tabstrip-item class and the custom theme fails to render correctly. Either Telerik blazor libary did not add this extra class to each tab item or theme builder is inserting this class when it should not. 

I can place this extra class on each TabStripTab element on its Class property, but I feel this is something that the actual Telerik for Blazor libray should do.

Looking at the source code of Telerik for Blazor library, the TabStipTab component generates add the k-item as default and then applies the value of property ClassToRender and its value is 

$"{ActiveCssClass} {DisabledCssClass} {Class} {FirstItemClass} {LastItemClass}".Trim()

The Class is an empty string, which I currently use to "fix" the problem but I certainly would like a better solution like a real fix :) 

Thank you telerik team

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